Only on the stomach for ulcer related issues. Ranitidine has been shown in some cases to help with the hind gut
Omeprazole is mainly used to prevent ulcers in horses that are subjected to stress or other conditions that make them prone to stomach ulcers. It is also used to treat cases of existing ulcers. Omeprazole is sometimes prescribed as a precaution when NSAIDs, corticosteroids, and other drugs known to cause stomach ulcers are administered. Maximum suppression of acid production occurs three to five days after beginning treatment. So far there have been no side effects
Omeprazole has no effect on the hind gut. Omeprazole acts only in the stomach by inhibiting acid secretion (this secretion of hydrochloric acid takes place only in the stomach).
The Zoetis Team